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<h2><span class="refentrytitle">Class template weak_ptr</span></h2>
<p>boost::interprocess::weak_ptr</p>
</div>
<h2 class="refsynopsisdiv-title">Synopsis</h2>
<div class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../interprocess/indexes_reference.html#doxygen.boost_interprocess_header_reference.weak__ptr_8hpp" title="Header &lt;boost/interprocess/smart_ptr/weak_ptr.hpp&gt;">boost/interprocess/smart_ptr/weak_ptr.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> VoidAllocator<span class="special">,</span> <span class="keyword">typename</span> Deleter<span class="special">&gt;</span> 
<span class="keyword">class</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">T</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1af5753ba11f1fad192b446c65abf85bdc"></a><span class="identifier">element_type</span><span class="special">;</span>
  <span class="keyword">typedef</span> <span class="identifier">T</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ace27a9a041f7c8de280bb554f3253bd7"></a><span class="identifier">value_type</span><span class="special">;</span>  

  <span class="comment">// <a class="link" href="../boost_container_header_reference/classboost_1_1container_1_1node__allocator.html#id67-bb">public member functions</a></span>
  <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1aeddbfcb8b7ba2174d61c59c5846bf607"><span class="identifier">weak_ptr</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Y<span class="special">&gt;</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a2a57ae8bb7ee21073a4ed68fa2b785b9"><span class="identifier">weak_ptr</span></a><span class="special">(</span><a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a><span class="special">&lt;</span> <span class="identifier">Y</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">D</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Y<span class="special">&gt;</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ac697619bd89e549edc52eb126d542d2a"><span class="identifier">weak_ptr</span></a><span class="special">(</span><a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a><span class="special">&lt;</span> <span class="identifier">Y</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">D</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Y<span class="special">&gt;</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> <span class="special">&amp;</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a4a6c7843b08df6798cdb12caaadfd40c"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a><span class="special">&lt;</span> <span class="identifier">Y</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">D</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Y<span class="special">&gt;</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> <span class="special">&amp;</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a803100d9fd06863337e7e69dfdd9bf6b"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a><span class="special">&lt;</span> <span class="identifier">Y</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">D</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">D</span> <span class="special">&gt;</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a6584724f3e78adb3d3fe89d731a1aeb0"><span class="identifier">lock</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">long</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ab3b67d0064b8f84fd596725e3fdaef76"><span class="identifier">use_count</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ac614508482f1e41a2531b85dfe45322c"><span class="identifier">expired</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a634c9f74dab02e859a69a0ad0af7c3b6"><span class="identifier">reset</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a35e72aedd9c51af676f545be9182db9d"><span class="identifier">swap</span></a><span class="special">(</span><span class="identifier">this_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.16.19.3.53.5.4"></a><h2>Description</h2>
<p>The <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> class template stores a "weak reference" to an object that's already managed by a <a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a>. To access the object, a <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> can be converted to a <a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a> using the <a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a> constructor or the member function lock. When the last <a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a> to the object goes away and the object is deleted, the attempt to obtain a <a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a> from the <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> instances that refer to the deleted object will fail: the constructor will throw an exception of type bad_weak_ptr, and <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a6584724f3e78adb3d3fe89d731a1aeb0">weak_ptr::lock</a> will return an empty <a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a>.</p>
<p>Every <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> meets the CopyConstructible and Assignable requirements of the C++ Standard Library, and so can be used in standard library containers. Comparison operators are supplied so that <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> works with the standard library's associative containers.</p>
<p><a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> operations never throw exceptions.</p>
<p>The class template is parameterized on T, the type of the object pointed to. </p>
<div class="refsect2">
<a name="id-1.3.16.19.3.53.5.4.6"></a><h3>
<a name="id67-bb"></a><code class="computeroutput">weak_ptr</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1aeddbfcb8b7ba2174d61c59c5846bf607"></a><span class="identifier">weak_ptr</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Effects: Constructs an empty <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a>. Postconditions: <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ab3b67d0064b8f84fd596725e3fdaef76">use_count()</a> == 0. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Y<span class="special">&gt;</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a2a57ae8bb7ee21073a4ed68fa2b785b9"></a><span class="identifier">weak_ptr</span><span class="special">(</span><a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a><span class="special">&lt;</span> <span class="identifier">Y</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">D</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> r<span class="special">)</span><span class="special">;</span></pre>
<p>Effects: If r is empty, constructs an empty <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a>; otherwise, constructs a <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> that shares ownership with r as if by storing a copy of the pointer stored in r.</p>
<p>Postconditions: <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ab3b67d0064b8f84fd596725e3fdaef76">use_count()</a> == r.use_count().</p>
<p>Throws: nothing. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Y<span class="special">&gt;</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ac697619bd89e549edc52eb126d542d2a"></a><span class="identifier">weak_ptr</span><span class="special">(</span><a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a><span class="special">&lt;</span> <span class="identifier">Y</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">D</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> r<span class="special">)</span><span class="special">;</span></pre>
<p>Effects: If r is empty, constructs an empty <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a>; otherwise, constructs a <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> that shares ownership with r as if by storing a copy of the pointer stored in r.</p>
<p>Postconditions: <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ab3b67d0064b8f84fd596725e3fdaef76">use_count()</a> == r.use_count().</p>
<p>Throws: nothing. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Y<span class="special">&gt;</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> <span class="special">&amp;</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a4a6c7843b08df6798cdb12caaadfd40c"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a><span class="special">&lt;</span> <span class="identifier">Y</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">D</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> r<span class="special">)</span><span class="special">;</span></pre>
<p>Effects: Equivalent to weak_ptr(r).swap(*this).</p>
<p>Throws: nothing.</p>
<p>Notes: The implementation is free to meet the effects (and the implied guarantees) via different means, without creating a temporary. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Y<span class="special">&gt;</span> <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html" title="Class template weak_ptr">weak_ptr</a> <span class="special">&amp;</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a803100d9fd06863337e7e69dfdd9bf6b"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a><span class="special">&lt;</span> <span class="identifier">Y</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">D</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> r<span class="special">)</span><span class="special">;</span></pre>
<p>Effects: Equivalent to weak_ptr(r).swap(*this).</p>
<p>Throws: nothing.</p>
<p>Notes: The implementation is free to meet the effects (and the implied guarantees) via different means, without creating a temporary. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a><span class="special">&lt;</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">D</span> <span class="special">&gt;</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a6584724f3e78adb3d3fe89d731a1aeb0"></a><span class="identifier">lock</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns: <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ac614508482f1e41a2531b85dfe45322c">expired()</a>? shared_ptr&lt;T&gt;(): shared_ptr&lt;T&gt;(*this).</p>
<p>Throws: nothing. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">long</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ab3b67d0064b8f84fd596725e3fdaef76"></a><span class="identifier">use_count</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns: 0 if *this is empty; otherwise, the number of <a class="link" href="classboost_1_1interprocess_1_1shared__ptr.html" title="Class template shared_ptr">shared_ptr</a> objects that share ownership with *this.</p>
<p>Throws: nothing.</p>
<p>Notes: <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ab3b67d0064b8f84fd596725e3fdaef76">use_count()</a> is not necessarily efficient. Use only for debugging and testing purposes, not for production code. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ac614508482f1e41a2531b85dfe45322c"></a><span class="identifier">expired</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns: Returns: <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ab3b67d0064b8f84fd596725e3fdaef76">use_count()</a> == 0.</p>
<p>Throws: nothing.</p>
<p>Notes: <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ac614508482f1e41a2531b85dfe45322c">expired()</a> may be faster than <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1ab3b67d0064b8f84fd596725e3fdaef76">use_count()</a>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a634c9f74dab02e859a69a0ad0af7c3b6"></a><span class="identifier">reset</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Effects: Equivalent to: <a class="link" href="classboost_1_1interprocess_1_1weak__ptr.html#doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1aeddbfcb8b7ba2174d61c59c5846bf607">weak_ptr()</a>.swap(*this). </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="doxygen.boost_interprocess_header_reference.classboost_1_1interprocess_1_1weak__ptr_1a35e72aedd9c51af676f545be9182db9d"></a><span class="identifier">swap</span><span class="special">(</span><span class="identifier">this_type</span> <span class="special">&amp;</span> other<span class="special">)</span><span class="special">;</span></pre>
<p>Effects: Exchanges the contents of the two smart pointers.</p>
<p>Throws: nothing. </p>
</li>
</ol></div>
</div>
</div>
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